Cupertino, Calif. – Apple Inc. started offering used iPhones at a discount on its online store, less than two months after the combination mobile phone and music player went on sale.

Consumers willing to buy a refurbished version can pay $100 less than the regular price, according to Apple’s website. A used 4-gigabyte model is $399, and the 8-gigabyte version is $499. Apple also sells other refurbished products at a discount.

Chief executive Steve Jobs aims to make the iPhone Apple’s third major business, alongside Macintosh computers and iPod music players. The company plans to sell 1 million iPhones by the end of September, adding to the 270,000 sold last quarter after the product’s U.S. debut June 29.

Apple spokeswoman Jennifer Bowcock declined to say how many used iPhones are in stock. The company’s refurbished inventory consists of products sent back under Apple’s 14-day return-and-refund policy. That program allows buyers to exchange a defective unit for a new product or a refund. Only some of the units had technical problems, and all refurbished products are tested, cleaned and repackaged, according to Apple’s site.

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